Image caption
The bulge is in the wall's steel plates, which are bolted together

A London Underground train has hit a bulge in a tunnel wall on the Bakerloo line leading to severe delays.

The line was suspended earlier between Elephant & Castle and Piccadilly Circus, but is now running with severe delays.

Transport for London (TfL) said the tunnel had not collapsed and no-one was injured.

Maintenance workers on three lines are currently on strike but the Bakerloo Line is not one of the affected lines.

The incident happened during the morning rush hour on Thursday.

The RMT union said the incident had been caused by water which had caused a bulge in the tunnel wall.

It has now called for a full safety inquiry and demanded that concerns about maintenance and cuts to staffing levels are included.

Steel plates

TfL confirmed the presence of the damaged wall and said work was carried out to resume full services as soon as possible.

The bulge was in the wall's steel plates, which are bolted together.

London Underground's operations director, Nigel Holness, said he expected a good service to be running on Friday.

BBC London's transport correspondent Tom Edwards said the damage was found by an emergency response unit.

Mr Holness added: "The problems this morning are not in any way connected with the industrial action taken by some maintenance workers on the Jubilee, Northern and Piccadilly lines, which has had no impact since the strike began."